用the number of 或 a number of 填空1.（ ）cares on the roads has doubled over the past few years in our country.2.We have been friends for ( )years.理由要说

用“the number of”和“a number of”一起造句 the number of,a small number of,a number of. a number of the number of the number of、a number of、large number的区别 最好给出解释（为什么这么选） 及a number of和the number of 的区别 ( )1.Look!( )people ( )swimming in the riverA.The number of ,are B.The number of ,is C.A number of ,are D.Anumber of ,is后面is和are呢 为什么用is或are the number of 和 a number of 它们有什么区别,它们后面加n复数还是n单数? a number of foreigners visited our school yesterday中为什么用a number of为什么不用the number of? a number of the students 谁来帮我做做这数学题目.1.the sum of 27 and a number n2.13 less than a number n and 23.twice a number x4.the quotient of a number n and 45.the number of minutes in s seconds6.the number of days in w weeks7.the number of pages in r reams of 高中英语题record number of books? record number of books were sold,up7.2% from ? year earlier用a或the填,求解释呵呵 a number of students还是a number of the students 如何知道什么时候该用the number of和a number of a number of 与the number of 分别可以用什么修饰 the number of.和a number of 的区别.什么时候用什么? a number of 谓语动词用单数还是复数,the number of呢? 请举例. 用a number of和the number of分别造两个句子.要中文! A great number of 与 The number of 的区别 the number of和a number of的区别